Polyurethane Crack Injection
One of our most popular methods for alleviating water intrusion is high-pressure injection of hydrophilic urethane foam grout. Small holes are drilled into concrete near the crack or other leak, a high-pressure fitting installed, and a thin, water-reactive urethane liquid injected at high pressure, following the path of the crack or penetration (conduit, wall joint, pipe penetration etc.). Upon contact with water the urethane expands, fillings cracks, joints, voids, holes, gaps in pipe penetrations etc.
The expansion creates foam "bladders" or dams that block water penetration and remain flexible - they will not re-crack and leak, a problem with older epoxy injection repairs. This is a tremendous time and money-saving system for below-grade parking structures, vaults (both walls and ceilings), sumps, mechanical rooms, elevator pits and basements. This procedure is done from the "negative side", eliminating the need for exterior excavation.